Originally Posted by noisebeam

Like I said, personal opinion. Without testing, only the person doing the activity can know how these internal factors affect them. Yes, there have been times I've cycled to work with a head cold and it did affect my senses. I did feel more out of it and less in tune with my surroundings. It did diminish my safety, but not significantly enough for me to not start the ride or stop during the ride.

Al